Description and biostratigraphy of the ammonite fauna from the Kazhdumi Formation at Tang-e-Maghar, Northwest of Behbahan (Zagros Basin)

Yavari, A.; Ghavidel Syooki, M.; Majidifard, M. R.; Vaziri, S. H.

doi:10.22071/gsj.2018.63827

Document Type : Original Research Paper

Authors

¹ Ph.D., Department of Geology, Islamic Azad University, North Tehran Branch, Tehran, Iran

² Professor, Faculty of Engineering, Institute of Petroleum Engineering, University of Tehran, Tehran, Iran

³ Assistant Professor, Research Institute for Earth Sciences, Geological Survey of Iran, Tehran, Iran

⁴ Professor, Department of Geology, Islamic Azad University, North Tehran Branch, Tehran, Iran

https://doi.org/10.22071/gsj.2018.63827

Abstract

The Kazhdumi Formation is well exposed and accessible in Tang-e Maghar, northwest of Behbahan city, Zagros basin. In this area, this formation has a thicknees of 344 m and it mainly consists of alternation of black - gray shale with medium – thin-bedded cream – gray argillaceous limestone. The lower contact of the Kazhdumi Formation is disconformable with Daryan Formation and conformable with the Sarvack Formation at the top. A total of 220 ammonite bearing surface samples were collected including the uppermost part of the Daryan Formation (5m) and the whole thickness of the Kazhdumi Formation (344m). This investigation resulted in 21 species (15 genera) which belong to six families. The encountered ammonite species of the upper part of the Daryan Formation and the whole Kazhdumi Formation consist of Douvilleiceras sp., Douvilleiceras cf. mammillatum, Epicheloniceras subnodosocostum– buxtorfi, Hypacanithoplites cf. elegnas, Acanthohoplites cf. aschiltaensis, Nolaniceras nolani, Parahoplites cf. melchioris, Venezoliceras sp., Venezoliceras cf. venezolanum, Mirapelia cf. buarquianum, Mirapelia sp., Oxytropidoceras carbonarium, Oxytropidoceras cf. roissyanum, Hysteroceras cf. orbignyi, Hysteroceras sp., Tonohamites cf. aequicingulatus, Mortoniceras sp., Mortoniceras aff. inflatum, Dufrenoyia sp., Hemiptychoceras cf. gaultinum and Scaphites sp.Amongst these ammonite species, Scaphites sp. and Hemiptychoceras gaultinum are recorded for the first time and the remainder has previously been recorded from this rock unit in the Zagros basin. Likewise, based on stratigraphic potential of the encountered ammonite species the lower Aptian is suggested for the upper part of the Daryan Formation and upper Aptian –upper Albian for the Kazhdumi Formation.Therefore, a hiatus is present between the Daryan and Kazhdumi formations, encompassing the middle Aptian.

Keywords

20.1001.1.10237429.1397.27.107.22.3

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Scientific Quarterly Journal of Geosciences

Description and biostratigraphy of the ammonite fauna from the Kazhdumi Formation at Tang-e-Maghar, Northwest of Behbahan (Zagros Basin)

References

References

Volume 27, Issue 107
Volume 26, Issue 107, spring 2018
June 2018
Pages 221-232

Description and biostratigraphy of the ammonite fauna from the Kazhdumi Formation at Tang-e-Maghar, Northwest of Behbahan (Zagros Basin)

References

References

Volume 27, Issue 107Volume 26, Issue 107, spring 2018June 2018Pages 221-232

Volume 27, Issue 107
Volume 26, Issue 107, spring 2018
June 2018
Pages 221-232